How to Kill Brown Saltwater Algae

There are hundreds of forms of algae -- types of plant-like life forms that grow in saltwater, freshwater and on land. Some scientists, according to Fun Science Project Ideas, believe algae produce 87 percent of the world's oxygen and remove carbon dioxide from the air. Though it has its place in nature, algae also can form in saltwater and freshwater aquariums, much to the chagrin of fish enthusiasts. Brown algae is common in saltwater aquariums. While there is such thing as a healthy amount of algae in your fish tank, regular cleaning and maintenance will prevent brown algae overgrowth.

Things You'll Need

  • Test kit
  • Scrub brush
  • Aquarium vacuum
  • Light timer (optional)
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Instructions

    • 1

      Use a test kit to test for silicates, which can build up when tap water is used, due to its high silicic acid content, and for nitrates, which can build up if water is not regularly changed. Both of these are among the main sources for brown algae growth. Purchase the kit from an aquarium supply store and follow the instructions to test levels. Test kits include methyl alcohol, glass test tubes, a syringe, plastic filter holder, check valve, filter paper and glass, and Tygon Tubing with an adapter. Adjust your saltwater levels, accordingly, based on the test results.

    • 2

      Change tank water every few weeks and more often if you have a high fish population. Regular water changing removes silicates and nitrates from the water.

    • 3

      Scrub algae on tank walls and rocks with a scrub pad. Vacuum the bottom of the tank, using an aquarium vacuum, every few weeks, before replacing with fresh saltwater. Rinse the scrub pad well once you are finished.

    • 4

      Refrain from over-feeding your fish, which results in more nutrients in the water and leads to algae growth.